Handy Units
Celsius to Kelvin°C → K
Formula: K = °C + 273.15
Formula
K = °C + 273.15
Example: 30 °C = 303.15 K
Temperature scales start from different zero points, so converting is more than multiplying: shift to a common zero (absolute zero, in kelvin), then scale by the size of a degree. That’s why 0 °C is 32 °F, not 0 °F.
Celsius and Kelvin chart
| Celsius (°C) | Kelvin (K) |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 36.5 °C | 309.65 K |
| 37 °C | 310.15 K |
| 38 °C | 311.15 K |
| 40 °C | 313.15 K |
| 100 °C | 373.15 K |
| 180 °C | 453.15 K |
| 200 °C | 473.15 K |
| Kelvin (K) | Celsius (°C) |
|---|---|
| 0 K | -273.15 °C |
| 100 K | -173.15 °C |
| 200 K | -73.15 °C |
| 273.15 K | 0 °C |
| 300 K | 26.85 °C |
| 373.15 K | 100 °C |
| 1,000 K | 726.85 °C |
About these units
Celsius (°C)Water freezes at 0 °C and boils at 100 °C at sea level. Used in most of the world.
Kelvin (K)The SI unit of temperature, counted from absolute zero: 0 K = −273.15 °C, with degrees the same size as Celsius.
Questions
How do I convert Celsius to Kelvin?
K = °C + 273.15; 30 °C = 303.15 K.